This model is 22 months old. The same company has since released something newer: GPT-6 (2026-10-07). The details below are still accurate for this model — it just is not what we would recommend today.
o1
OpenAI🇺🇸 United States
OpenAI reasoning model that works through a chain of thought before answering.
Context window200K tokens
Input / 1M tokens$15
Output / 1M tokens$60
Version History
launchmajor
o1 released. OpenAI reasoning model that works through a chain of thought before answering.